Honda 2 Wheelers India — complaint about improper information of change part in my activa 3g

Address:

Dharwad, Karnataka, 580004

On december 1st i had given my bike for service in honda service center. I had a problem in self start. They suggested me for change of relay but the problem was not resolved. And when i again went to service center they said that battery was dead and replaced it with new one. But wen i enquired about the change part (Relay) they are saying it was a fake part so we replaced. I never give my bike to any other service stations. Now my question is that
1) how the fake part come in my bike?
2) when they dont know what is the problem, why are they changing the parts without giving any explanations.?
Please do go through the bills attached.